var URLEncoder = {
	// public method for url encoding
	encode : function (string) {
	    return escape(this._utf8_encode(string));
	},

	// public method for url decoding
	decode : function (string) {
	    return this._utf8_decode(unescape(string));
	},

	// private method for UTF-8 encoding
	_utf8_encode : function (string) {
	    string = string.replace(/\r\n/g,"\n");
	    var utftext = "";
	
	    for (var n = 0; n < string.length; n++) {
	
	        var c = string.charCodeAt(n);
	
	        if (c < 128) {
	            utftext += String.fromCharCode(c);
	        }
	        else if((c > 127) && (c < 2048)) {
	            utftext += String.fromCharCode((c >> 6) | 192);
	            utftext += String.fromCharCode((c & 63) | 128);
	        }
	        else {
	            utftext += String.fromCharCode((c >> 12) | 224);
	            utftext += String.fromCharCode(((c >> 6) & 63) | 128);
	            utftext += String.fromCharCode((c & 63) | 128);
	        }
	
	    }
	
	    return utftext;
	},

	// private method for UTF-8 decoding
	_utf8_decode : function (utftext) {
	    var string = "";
	    var i = 0;
	    var c = c1 = c2 = 0;
	
	    while ( i < utftext.length ) {
	
	        c = utftext.charCodeAt(i);
	
	        if (c < 128) {
	            string += String.fromCharCode(c);
	            i++;
	        }
	        else if((c > 191) && (c < 224)) {
	            c2 = utftext.charCodeAt(i+1);
	            string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
	            i += 2;
	        }
	        else {
	            c2 = utftext.charCodeAt(i+1);
	            c3 = utftext.charCodeAt(i+2);
	            string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
	            i += 3;
	        }
	
	    }
	
	    return string;
	}
}